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consisting with the soil designations (Overburden,and Sand and Gravel)were used in the <br /> slope stability analysis.While the corresponding friction angles and cohesion values were <br /> discussed under the Analysis and Recommendations section of the ECC report,the unit <br /> weight for each material was not.Additionally,when reviewing the bore logs,two different <br /> densities are identified with the Sand and Gravel designation.Please clarify and provide to <br /> the Division the material properties for each soil designations used in the stability analysis. <br /> • As discussed earlier in the memo as well is in the ECC report,two slope stability analyses <br /> under seismic conditions were performed.However,there is no discussion or information <br /> regarding the seismic coefficient that was applied to both analyses.Please provide the <br /> Division with the seismic coefficient that was used in ECCs seismic slope stability analyses. <br /> This concludes my review and comments for the proposed 112c Permit Application for the Stiles Mining <br /> Resource Mine submitted by Asphalt Specialties,Co.,Inc. in relation to the requested and applicable <br /> Rules,Regulations and Policies. If you have any questions feel free to contact me. <br /> Sincerely, <br /> Zach Trujillo <br /> Environmental Protection Specialist <br /> (303) 866-3567 ext. 8164 <br /> Zach.Trujillogstate.co.us <br /> Stiles Mining Resource Review Memo January 24,2022 <br />